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Cell Structures and Functions

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What is the central vacuole and its role in plant cells?

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The central vacuole is a large, water-filled organelle that provides structural support, stores nutrients and waste products, and helps in plant growth.

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What is the function of the nucleolus?

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The nucleolus is involved in the production and assembly of ribosome components within the nucleus.

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What is the function of the mitochondria?

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The mitochondria are the powerhouse of the cell, providing energy through ATP by the process of cellular respiration.

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What is the purpose of the cytoskeleton?

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The cytoskeleton provides structural support for the cell, aids in cell division, and facilitates cell movement and intracellular transport.

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What is the structure and function of the plasma membrane?

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The plasma membrane is a phospholipid bilayer that controls the movement of substances into and out of the cell, maintaining homeostasis.

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What is the role of ribosomes?

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Ribosomes are responsible for protein synthesis by reading mRNA and linking together amino acids.

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What is the function of the Golgi apparatus?

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The Golgi apparatus modifies, sorts, and packages proteins and lipids for storage or transport out of the cell.

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Describe the function of microtubules.

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Microtubules are part of the cytoskeleton and help in maintaining cell shape, cell division, and intracellular transport of organelles and vesicles.

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What are lysosomes and what do they do?

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Lysosomes are membrane-bound organelles that contain enzymes for breaking down cellular waste and debris.

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How do chloroplasts function in a cell?

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Chloroplasts are the sites of photosynthesis in plant cells, converting light energy into chemical energy stored as glucose.

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What is the role of transport vesicles?

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Transport vesicles move molecules between different locations inside the cell, such as between the endoplasmic reticulum and Golgi apparatus.

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How does the smooth endoplasmic reticulum function?

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The smooth endoplasmic reticulum synthesizes lipids, metabolizes carbohydrates, detoxifies drugs and poisons, and stores calcium ions.

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Explain the process of endocytosis.

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Endocytosis is the process by which the cell takes in materials by engulfing them in a section of the plasma membrane that pinches off to form an internal vesicle.

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What is the significance of interphase in the cell cycle?

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Interphase is the longest phase of the cell cycle where the cell grows, performs its functions, duplicates DNA, and prepares for division.

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What role does the rough endoplasmic reticulum play in the cell?

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The rough endoplasmic reticulum is studded with ribosomes and is involved in protein synthesis, modification, and transport.

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What is the significance of the nucleoplasm?

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The nucleoplasm is the semi-fluid substance within the nucleus, providing a medium for the suspension of nuclear structures like nucleotides and enzymes.

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What does the term 'extracellular matrix' refer to?

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The extracellular matrix is a network of proteins and carbohydrates outside the cell that provides structural and biochemical support to surrounding cells.

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What is a centrosome and what role does it play during cell division?

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A centrosome is an organelle near the nucleus in animal cells that contains centrioles and serves as a microtubule-organizing center during cell division.

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What are peroxisomes and what is their function?

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Peroxisomes are organelles that contain enzymes for breaking down fatty acids and detoxifying harmful substances.

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Define the term 'plasmodesmata'.

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Plasmodesmata are channels that traverse the cell walls of plant cells, allowing transport and communication between neighboring cells.

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How do cell junctions function?

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Cell junctions are structures that connect cells to each other, facilitating communication and creating tissue stability by providing a seal or a mechanical linkage.

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What is the purpose of cell wall in plant cells?

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The cell wall is a rigid layer outside the plasma membrane that provides protection, structural support, and shape to plant cells.

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Describe how actin filaments work in a cell.

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Actin filaments, also known as microfilaments, are part of the cytoskeleton and play a role in cell movement, shape, and division.

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What is the significance of the nucleotide 'ATP' in cellular activities?

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ATP, or adenosine triphosphate, serves as the main energy currency of the cell, powering various cellular processes by releasing energy when it's converted to ADP.

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How do gap junctions function in cells?

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Gap junctions are specialized intercellular connections that allow for direct chemical and electrical signaling between cells by forming channels.

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Explain the purpose of cellular respiration.

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Cellular respiration is the process by which cells convert glucose into ATP, releasing energy stored in the chemical bonds of glucose.

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What is osmosis in the context of cell membrane function?

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Osmosis is the diffusion of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.

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What is autophagy in cells?

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Autophagy is the process by which cells degrade and recycle their own components through the formation of autophagosomes that fuse with lysosomes.

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What is a flagellum and what is its function?

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A flagellum is a whip-like structure that enables movement in certain cells, propelling the cell through its environment.

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